If the pair of lines $a x^2+2 h x y+b y^2+2 g x+2 f y+c=0$ intersect on the $y$ - axis then

If the pair of lines $a x^2+2 h x y+b y^2+2 g x+2 f y+c=0$ intersect on the $y$ - axis then
  1. $2 f g h=b g^2+c h^2$
  2. $\mathrm{bg}^2 \neq \mathrm{ch}^2$
  3. $a b c=2 f g h$
  4. none of these

Solution

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Asked in: JEE Main 2002

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